@ -- one entry in the following table for each leaf.
@ --
@ CREATE TABLE leaf(rid INTEGER PRIMARY KEY);
@
@ -- Events used to generate a timeline
@ --
@ CREATE TABLE event(
@   type TEXT,                      -- Type of event: 'ci', 'w', 'e', 't', 'g'
@   mtime DATETIME,                 -- Time of occurrence. Julian day.
@   objid INTEGER PRIMARY KEY,      -- Associated record ID
@   tagid INTEGER,                  -- Associated ticket or wiki name tag
@   uid INTEGER REFERENCES user,    -- User who caused the event
@   bgcolor TEXT,                   -- Color set by 'bgcolor' property
@   euser TEXT,                     -- User set by 'user' property
@   user TEXT,                      -- Name of the user